Pin Function Grouping
PA, PB, VDD, VSS, VCAP, Reset, Boot, etc., and set every pin’s Section to exactly match its Pin Group.GPIO, supplies/grounds will become broad Power/Ground/Analog, and each pin’s Section will match its Pin Group.GPIO, supplies/regulator pins are Power, grounds are Ground, VREF+ is Analog, and reset/boot are Control. Each pin’s Section matches its Pin Group.STM32F427IIT6